Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I'm a Senior Full Stack Engineer with 8+ years of experience delivering end-to-end, production-grade web platforms across finance, healthcare, SaaS, and eCommerce domains. I specialize in React, TypeScript, Node.js, and Python, and I take ownership of API design, cloud-native systems, and scalable frontend architectures. I’m known for pragmatic technical leadership, mentoring engineers, and translating evolving product requirements into reliable, maintainable systems used by real users at scale. I collaborate closely with product and design teams to turn growth ideas into measurable technical improvements and maintain high standards through code reviews and architectural guidance.…I'm a Senior Full Stack Engineer with 8+ years of experience delivering end-to-end, production-grade web platforms across finance, healthcare, SaaS, and eCommerce domains. I specialize in React, TypeScript, Node.js, and Python, and I take ownership of API design, cloud-native systems, and scalable frontend architectures. I’m known for pragmatic technical leadership, mentoring engineers, and translating evolving product requirements into reliable, maintainable systems used by real users at scale. I collaborate closely with product and design teams to turn growth ideas into measurable technical improvements and maintain high standards through code reviews and architectural guidance.

Marcel Danciu

Full Stack Developer, Back-End Developer, Front-End Developer, +2





I'm a Senior Full Stack Engineer with 8+ years of experience delivering end-to-end, production-grade web platforms across finance, healthcare, SaaS, and eCommerce domains. I specialize in React, TypeScript, Node.js, and Python, and I take ownership of API design, cloud-native systems, and scalable frontend architectures. I’m known for pragmatic technical leadership, mentoring engineers, and translating evolving product requirements into reliable, maintainable systems used by real users at scale. I collaborate closely with product and design teams to turn growth ideas into measurable technical improvements and maintain high standards through code reviews and architectural guidance.…I'm a Senior Full Stack Engineer with 8+ years of experience delivering end-to-end, production-grade web platforms across finance, healthcare, SaaS, and eCommerce domains. I specialize in React, TypeScript, Node.js, and Python, and I take ownership of API design, cloud-native systems, and scalable frontend architectures. I’m known for pragmatic technical leadership, mentoring engineers, and translating evolving product requirements into reliable, maintainable systems used by real users at scale. I collaborate closely with product and design teams to turn growth ideas into measurable technical improvements and maintain high standards through code reviews and architectural guidance.

Available to hire

I’m a Senior Full Stack Engineer with 8+ years of experience delivering end-to-end, production-grade web platforms across finance, healthcare, SaaS, and eCommerce domains. I specialize in React, TypeScript, Node.js, and Python, and I take ownership of API design, cloud-native systems, and scalable frontend architectures.

I’m known for pragmatic technical leadership, mentoring engineers, and translating evolving product requirements into reliable, maintainable systems used by real users at scale. I collaborate closely with product and design teams to turn growth ideas into measurable technical improvements and maintain high standards through code reviews and architectural guidance.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Advanced

Work Experience

Senior Full Stack Engineer at Xivic

October 1, 2024 - Present

Owned end-to-end delivery of a headless eCommerce platform, building React + TypeScript storefronts and GraphQL APIs with a focus on scalability and performance. Designed and optimized checkout, catalog, and pricing flows, improving page response times and increasing conversion rates by ~25%. Implemented Redux Toolkit-based state management and performance optimizations (memoization, selective re-renders) for high-traffic user journeys. Improved backend reliability through PostgreSQL query optimization, Redis caching, and structured API contracts. Deployed and operated services on AWS EKS, contributing to monitoring and alerting via Grafana and CloudWatch. Collaborated with product and design teams, translating growth initiatives into measurable technical improvements. Acted as senior contributor in architectural discussions and code reviews, reinforcing quality and maintainability standards.

Senior Full Stack Engineer at Arnia Software

March 1, 2022 - September 30, 2024

Led development of multiple enterprise SaaS platforms, owning both React/TypeScript frontends and Node.js / Python backends. Designed REST and GraphQL APIs with versioning strategies and contract validation. Built serverless architectures using AWS Lambda and API Gateway, reducing infrastructure overhead and deployment time. Implemented workflow automation and integration platforms, enabling onboarding of enterprise customers with complex requirements. Delivered analytics and BI dashboards with high-performance React components and optimized backend query paths, reducing reporting latency by ~35%. Introduced CI/CD pipelines with GitHub Actions, improving deployment reliability and test coverage. Mentored mid-level engineers through code reviews, architectural guidance, and documentation, strengthening team autonomy.

Senior Full Stack Engineer at Atta Systems

June 1, 2020 - February 28, 2022

Developed secure healthcare platforms handling sensitive clinical and telemedicine data under strict compliance requirements. Implemented React + TypeScript applications with Redux Toolkit, focusing on complex form workflows and role-based access control. Designed and maintained Django and Node.js APIs, modeling complex medical data in PostgreSQL. Built real-time telemedicine systems, including GraphQL APIs and scalable frontend communication layers. Deployed microservices on AWS ECS and EKS, contributing to observability, logging, and production debugging. Improved system reliability under peak load through caching strategies and backend performance tuning. Played a senior role in cross-functional collaboration with product, UX, and QA teams in Agile delivery cycles.

Full Stack Engineer at Qualysoft

July 1, 2016 - May 31, 2020

Progressed from Full Stack Developer to senior responsibilities while delivering large-scale financial systems. Built React and TypeScript–based customer portals for core banking use cases, improving page load performance by ~30%. Designed risk analytics and reporting UIs, integrating complex datasets with backend services. Implemented and optimized Node.js and GraphQL APIs, supporting flexible regulatory reporting requirements. Worked extensively with PostgreSQL schema design, query optimization, and data consistency strategies. Introduced Storybook-driven component design, improving frontend consistency across teams. Contributed to AWS infrastructure, containerized deployments with Docker, and CI/CD pipelines with Jenkins. Actively mentored junior engineers and upheld clean architecture, testing, and code review practices.